Colorado frost dates: W
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Walden | frost any month | 4b | ||
| Walsenburg | May 6 | Oct 4 | 151 d | 6a |
| Walsh | Apr 30 | Oct 14 | 167 d | 6b |
| Ward | Jun 21 | Sep 2 | 73 d | 5b |
| Watkins | May 5 | Oct 9 | 157 d | 6a |
| Weldona | May 6 | Oct 6 | 153 d | 5a |
| Wellington | May 3 | Oct 6 | 156 d | 5b |
| Westcliffe | Jun 11 | Sep 9 | 90 d | 5b |
| Westminster | May 2 | Oct 11 | 162 d | 6a |
| Weston | May 11 | Oct 4 | 146 d | 6a |
| Wetmore | Jun 11 | Sep 9 | 90 d | 6a |
| Wheat Ridge | May 5 | Oct 5 | 153 d | 6a |
| Whitewater | Apr 23 | Oct 20 | 180 d | 6a |
| Wiggins | May 6 | Oct 6 | 153 d | 5a |
| Wild Horse | May 4 | Oct 8 | 157 d | 6a |
| Wiley | May 2 | Oct 7 | 158 d | 6a |
| Windsor | May 3 | Oct 6 | 156 d | 5b |
| Winter Park | frost any month | 5a | ||
| Wolcott | Jun 21 | Sep 7 | 78 d | 6a |
| Woodland Park | Jun 1 | Sep 21 | 112 d | 5a |
| Woodrow | May 15 | Oct 2 | 140 d | 5b |
| Woody Creek | May 31 | Sep 23 | 115 d | 5b |
| Wray | May 7 | Oct 6 | 152 d | 5b |